No! Please don't go to bed! If you really want it, you need to stay up for it!
The worst thing you can do is bid early then check if you won it in the morning, how do you know someone else won't put a bid in while you're asleep?
Others probably have the same idea as you, they will probably bid late too, but that's why you can't afford to miss out on seeing if you won or not, or getting a second chance to rebid if someone outbids you. A big shitload of bids will probably suddenly come in in the last minute or so. You go to bed, and you won't know what happened til you wake up
Also remember to set a max bid in case someone else does bid, that's the money you're willing to pay
Have a big sleep hours before it ends so you don't get tired
I really hope you win! And good luck xxx :)